A 79-year-old mathematician may have just solved an infinite dimension puzzle that's vexed theorists for decades
Mathematician Per Enflo, who solved a huge chunk of the 'invariant subspaces problem' decades ago, may have just finished his work.
TroibNews 
Mathematician Per Enflo, who solved a huge chunk of the 'invariant subspaces problem' decades ago, may have just finished his work.
